Hi Rodolfo,
You may want to check with the Office:mac folks on this through the link below.
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I bought office for the mac,but I cannot registrate. I used a wrong password
and now I cannot change it.
I only see a green circle going around without result>>
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I hope this helps you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Microsoft Office:Mac newsgroups:
news://msnews.microsoft.com/microsoft.public.mac.office
or
http://microsoft.com/mac/community/community.aspx?pid=newsgroups
Microsoft Office:Mac products and updates
http://microsoft.com/mac